/Engine/Source/Editor/UnrealEd/Public/SKeySelector.h
Helper to generate the filtered list of keys, based on the search string matching
bool GetChildrenMatchingSearch ( const [TArray](API\Runtime\Core\Containers\TArray)< [FString](API\Runtime\Core\Containers\FString) > & SearchTokens, const [TArray](API\Runtime\Core\Containers\TArray)< FKeyTreeItem > & UnfilteredList, [TArray](API\Runtime\Core\Containers\TArray)< FKeyTreeItem > & OutFilteredList )